Stock and die for use in screwing metals



Jun e14, 1938. J. D. WALKER 2,120,689

STOCK AND DIE FOR USE IN SCREWING METALS Filed Aug. 3, 1937 5 Sheets-Sheet l 76. fiiZ.

1771 5/7/0/2 Ozzy/964% {Ma/M June 14, 1938. J. D. WALKER I STOCK AND DIE FOR USE] IN SCREWING METALS Z, 1937 3 Sheets-Sheet 2 Filed Aug.

fire/772K 1271/ 6 )z Ka le 1v WAQdI/m/ fli/Zu June 14, 1938. J. D. WALKER 2,120,689

STOCK AND DIE FOR USE IN SCREWING METALS I Filed Aug. 3, 1957 5 Shets-Sheet s l 20% Zr f t E q! I-nnnnnnnnm Patented June 14, 1938 UNITED STATES STOCK AND DIE FOR USE IN SCREWING METALS John Dennis Walker, Glasgow, Scotland Application August 3,

1937, Serial No. 157,093

In Great Britain June 28, 1937 9 Claims.

This invention relates to stocks and dies for use in screwing metals, and it has for its object certain improvements designed primarily to enable the rapid cutting of screw-threads to vary fine limits of size, the construction and arrangements of the parts moreover, being such that the removal of one set of dies and the substitution of others may be easily and rapidly effected, the tool as a whole being sufiiciently strong to Withstand the conditions of ordinary use.

The die is formed of a plurality of sections carried in a known manner and actuated by a sleeve screwed into the stock, a portion of which sleeve surrounds the die and contacts with the outer ends of the sections thereof, and is of tapered bore, whereby, when the sleeve is screwed in one direction to produce movement of same in an axial direction at a right angle to the plane in which lie said sections, the latter will be moved radially inward.

According to the present invention provision is made whereby the dies may be controlled to cut to micrometric dimensions, in combination with means whereby the micrometric adjusting means may be freed from the aforesaid sleeve'to enable the latter to be coarsely adjusted to any desired extent, without employing said micrometric adjusting means.

According to one construction, the sleeve is formed in two concentrically arranged superposed relatively revoluble releasably connected parts, one of which is provided with a micrometer device whereby the limit of inward radial movement of the dies may be controlled to produce threads to very fine liniits, the arrangement being such that the dies may be opened to free the work or to start the cutting of a thread without disturbing the setting made to control the limit of inward movement of the dies as just above referred to.

Preferably means are provided for locking the sleeve in any desired position within the stock.

The invention will now be described with reference to the accompanying drawings, in which:-

Fig. 1 is a plan of a stock and die according to this invention.

Fig. 2 is a section taken on line AB, Fig. 1.

Fig. 3 is a section taken on line C--D, Fig. 2.

Fig. 4 is a plan of the underside of the main body portion of the stock frame.

Fig. 5 is a section taken on line E--F, Fig. 1.

Fig. 6 is a side view showing various components removed from the body of said stocks.

Referring to the accompanying drawings, I

indicates the main frame or body portion of the stock, which is provided with handles 2, and the central aperture 3 of which frame is screw threaded to receive a sleeve 4 provided at its upper end with an outwardly extending milled flange 5. The sleeve 4 and flange 5 may be formed integral, but preferably as shown in the drawings the flange 5 is formed upon the edge of a disc 6 which, upon its underside, is recessed to receive a disc 1 having a central opening 8 with which engages an extension 9 surrounding the opening H! in said disc 6.

Projecting from the edge of disc 6 is a lug I I, which is inclined upwardly with respect to the upper surface of the disc I, and engages a slot I2 formed in the edge of disc 6. The purpose of this lug will be hereafter more fully explained.

Located upon the inner face of the disc I is an annular body I3 having its periphery inclined as shown in the drawings. 20

The parts 6, I and I3 are connected together by means of screws I4 secured at their lower ends to part I3 and passing through discs 6 and 1, nuts I5 upon the outer ends of the screws serving to draw the parts together so that they bea come, in efiect, a solid body.

The upper end of the bore of the sleeve 4 is coned as shown at I6, the periphery of the coned annular body I3 engaging said coned surface and when the nuts I5 are tightened connecting the said annular body I3 to said sleeve in a manner such that when the disc 6 is rotated the sleeve 4 will be rotated with it.

When the nuts I5 are slack, the disc 6 and the parts associated therewith may be rotated independently of the sleeve 4.

Reference has already been made to the lug II, the purpose of which is to carry a stop having a micrometer adjustment. The stop comprises a screw I! having a milled head and sleeve 40 I8 such as is commonly provided upon micrometers, said screw engaging a thread formed in a boss I9 projecting laterally from the end of the lug II, the sleeve l8 being bored to permit theboss l9 to pass therein, also after the manner of the usual micrometer. Both the sleeve and outer surface of the boss may have indications thereon which may indicate the diameter of the thread which will be formed with the dies set in a certain position, or the marking may be purely arbitrary, and bear no direct relationship to the diameter of the thread being out.

A lock-nut 20 is provided for the screw IT.

A stop 20a is provided, which is preferably removable, which stop contacts with the head of the screw tolimit the rotation of the sleeve 4.

By making the connection between the sleeve and its operating means capable of disconnection, it is possible to give a rough initial setting to the parts before they are clamped together by the nuts IS, the micrometer adjustment being then effected so that the parts of the micrometer being locked, repetition work to fixed dimensions is readily possible.

Preferably the height of stop 20a is capable of adjustment, to which end the stop is provided with a screw-thread engaging a threaded hole 2i in the stock, a grub screw 22 being provided to regulate the extent to which the screw on the stop enters the hole.

In order to secure a more rigid connection between the sleeve 4 and its operating means, the engaging coned surfaces of body 13 and the coned surface of the sleeve engaged by said body are milled or roughened as indicated.

The lower portion of the bore of the sleeve 4 is outwardly coned or tapered in a downward direction, as indicated at 23;

R iveted to spigots 24 formed upon the lower or' countersunk headed ends of screws 25 is a plate 26, shown more clearly in Figs. 2 and 6.

The bolts 25 are provided with plain shanks 21 and the screw-threaded upper ends of these bolts, which extend through the upper face of the stock frame are provided with milled thumb nuts 28, which latter, when screwed down, hold said bolts so that these in turn hold the plate 26 securely in position within the lower face of said frame, which face is suitably recessed at 29 to accommodate said plate.

30 indicates a boss formed upon the inner face of plate 26, said boss being shaped as shown, and being provided with four radial grooves or slots 3|, each of which slots extends from the periphery of the boss to the central perforation 32 thereof, and carries a die section the said boss projecting into the sleeve 4, the sections being retained in their slots by the annular projection 33 upon the inner end face of the boss.

A disc 34 secured to the inner end of the boss by screws 35 has its inner face provided with an annular channel 36 to receive the projection 33.

3'! indicates generally the die which is formed of four sections 38, each of which sections is bevelled at its outer end and is slidingly fitted within one of the aforementioned radial slots 3|, with its bevelled end contacting with the tapered portion 23 of the sleeve 4, so that, as the latter is screwed downwardly within the stock, it will cause said sections to move radially inward.

Preferably each section is provided at its outer end with a perforation 39, through which is passed a spring 40, the action of which is to push the sections 38 outwards so that their bevelled ends engage the coned inner surface 23 of the sleeve 4.

The spring is gapped as shown, so as to permit the ready removal of the sections.

In order that the spring 40 may not prevent the desired inward movement of the sections, the boss 30 is provided with a circumferential groove 4|.

Provided in the frame I, at one side of the sleeve 4, is a perforation 42, bored to permit the passage of a spindle 43, having an enlargement 43a. at one end, the inner face of which is curved to the contour of theouter surface of the sleeve 4, and has grooves thereon forming teeth to engage the teeth on the sleeve.

slidingly mounted upon the other part of the said spindle is a sleeve 44, having a face similar to that on part 43a, also shaped to engage the thread on sleeve 4.

The portion of the spindle upon which is slidingly mounted the sleeve 44 is screw-threaded and at its outer end is provided with a thumb nut 45, the arrangement being such that when it is desired to clamp the sleeve 4 against rotation, the thumb nut 45 is rotated to draw the members 33a and 44 toward each other and consequently cause them to tightly engage the sleeve and hold it against rotation.

A guide may be provided which is adjustable within such limits as will enable it to grip sizes of metal to be screwed which are within the limits of the capacity of the stocks, and said guide may be in the form shown and which comprises two jaws 4?, 48 housed in channels formed in the disc 49, secured in any suitable manner to the lower face of plate 26, as, for example, by means of the screws 49a, Figs. 3 and 4. The screws 49a are tapped into the body 39. The jaws are engaged by screws 50 engaging appropriately curved slots 5| in plate 52, and passing through openings 49?) formed. longitudinally of the jaws 4'! and 48 and indicated by dotted lines in Fig. 4.

By rotating plate 52 in one or other direction, the jaws will be opened or closed in accordance with the size of metal being screwed.

I claim:

1. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, a central opening in said boss, radial grooves in said boss, a diesection mounted to slide along each of said grooves, a' plate bridging said grooves to retain said die sections slidingly therein, a sleeve screwed into the said stock, an internally tapered portion forming part of said sleeve, which portion surrounds said die and contacts with the outer ends of the sections thereof, whereby, when said sleeve is screwed in one direction to produce movement of same axially and at a right angle to the planein which lie said sections, the latter will be moved radially inward, and settable means for ensuring the adjustment of the dies to repeatedlyv produce a thread of a certain dimension comprising a member revolubly mounted on said sleeve, means adjustably connecting said member to said sleeve, a projection upon said member and means upon the stock engaging said projection.

2. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, a central opening in said boss, radial grooves in said boss, a die section mounted to slide along each of said grooves, a platebridging said grooves to retain said die sections slidingly therein, a sleeve screwed into the said stock, an internally tapered portion forming part of said sleeve, which portion surrounds said die and contacts with the outer ends of the sections thereof, whereby, when said sleeve is screwed in one direction to produce movement of same axially and at a right angle to the plane in which lie said sections, the latter will be moved radially inward, and a spring acting upon said die sections tocause their outer ends to bear against the internally tapered portion of the sleeve, and settable means for ensuring the adjustment of the dies to repeatedly produce a thread of a certain dimension comprising a member revolubly mounted on said sleeve,

means adjustably connecting said member to said sleeve, a projection upon said member and means 'upon the stock engaging said projection.

3. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate, projecting axially into said stock, a central opening in said boss, radial grooves or slots in said boss, 2. die section mounted to slide along each of said grooves, a plate bridging said grooves to retain said die sections slidingly therein, a sleeve screwed into said stock, an internally tapered or coned portion disposed at one end of said sleeve; 2. second and smaller diametered internally tapered or coned portion disposed at the other end of said sleeve, said first coned portion surrounding said die and contacting with the outer ends of the die sections, a spring acting upon said sections to maintain their outer ends in contact with said first coned surface, an annular member, having an outer coned periphery engaging the second coned surface within the sleeve, screws projecting outwardly from one side of said annular member, a centrally perforated disc resting upon the top of the sleeve and perforated for the passage of the screws upon the annular coned body, nuts upon said screws whereby the coned annular body may be caused to tightly engage the coned surface of the sleeve with which it contacts so that when said disc is rotated in one or other direction the die sections will be caused to move in their slots or by slacking the nuts the outer disc may be rotated independently of the annular conical member for purposes of adjustment, and stop means whereby the terminal position of the sleeve may be adjusted.

i. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, a central opening in said boss, radial grooves or slots in said boss, 2, die section mounted to slide along each of said grooves, a plate bridging said grooves to retain said die sections slidingly therein, a sleeve screwed into said stock, an internally tapered or coned portion disposed at one end of said sleeve, a second and smaller diametered internally tapered or coned portion disposed at the other end of said sleeve, said first coned portion surrounding said die and contacting with the outer ends of the die sections, a spring acting upon said sections to maintain their outer ends in contact with said first coned surface, an annular member having an outer coned periphery engaging the second coned surface within the sleeve, screws projecting outwardly from one side of said annular member, a centrally apertured disc resting upon the top of the sleeve, perforations in said disc for the passage of the screws just referred to, an upwardly extending radially disposed projection upon said disc, a second centrally apertured disc resting upon said first disc, perforations in said second disc for the passage of the screws in the coned annular body, a peripheral opening in the second disc for the passage of the projection on the first disc, nuts upon said screws whereby the coned annular body may be caused to tightly engage the coned surface of the sleeve with which it contacts so that when said disc is rotated in one or other direction the die sections will be caused to move in their slots, or -.by slacking the nuts the outer disc may be rotated independently of the annular conical member for purposes of adjustment, and stop means whereby the terminal position of the sleeve may be adjusted, said stop means comprising a screw passing through the said projection of the second disc at a right angle to said projection, a head at one end of said screw, a lock nut on said screw, and a projection on the stock adapted to engage the head of the screw and so limit the rotary movement of the sleeve.

5. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, said boss having a central opening and radial grooves or slots located therein, a die carried by said stock, said die comprising a plurality of sections mounted to slide along said radial grooves or slots, said sliding action causing said die sections to move radially within said stock, a plate bridging said grooves to retain said die sections slidingly therein, a sleeve screwedinto said stock, an internally tapered portion forming part of said sleeve which,

surrounds said die and contacts with the outer ends of the sections thereof, whereby, when said sleeve is screwed in one direction to produce movement of same axially and at a right angle to the plane in which lie said sections, the latter will be moved radially inward, means for ensuring the adjustment of the dies to repeatedly produce a thread of a certain dimension, and means for locking the sleeve against rotation, said locking means comprising a screw disposed at a right angle to the axis of the sleeve, an enlargement upon said screw at one end, a curved surface upon said enlargement, grooves upon said surface adapted to engage the threads upon the sleeve, a sleeve slidably mounted upon the shank of the screw also provided with a surface adapted to engage the threads of the die carrying sleeve, a nut upon said screw engaging the outer end of the sleeve to enable the locking elements to tightly engage the die carrying sleeve to prevent its rotation.

6. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, a central opening in said boss, radial grooves or slots in said boss, a die section mounted to slide along each of said grooves, a plate bridging said grooves to retain said die sections slidingly therein, a sleeve screwed into said stock, an internally tapered or coned portion disposed at one end of said sleeve, a second and smaller diametered internally tapered or coned portion disposed at the other end of said sleeve, said first coned portion surrounding said die and contacting with the outer ends of the die sections, a spring acting upon said sections to maintain their outer ends in contact with said first coned surface, an annular memher, having an outer coned periphery engaging the second coned surface within the sleeve, screws projecting outwardly from one side of said annular member, a centrally perforated disc resting upon the top of the sleeve and perforated for the passage of the screws upon the annular coned body, nuts upon said screws whereby the coned annular body may be caused to tightly engage the coned surface of the sleeve with which it contacts so that when said disc is rotated in one or other direction the die sections will be caused to move in their slots, or by slacking the nuts, the outer disc may be rotated independently of the annular conical member for purposes of adjustment, and stop means whereby the terminal position of the sleeve may be adjusted, and means for locking the sleeve against rotation comprising a screw disposed at a right angle to the axis of the sleeve, an enlargement upon said screw at one end, a curved surface upon said enlargement, grooves upon said surface adapted to engage the threads upon the sleeve, a sleeve slidably mounted upon the shank of the screw also provided with a surface adapted to engage the threads of the die carrying sleeve, a nut upon said screw engaging the outer end of the sleeve to enable the locking elements to tightly engage the die carrying sleeve to prevent its rotation.

7. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, a central opening in said boss, radial grooves or slots in said boss, a die section mounted to slide along each of said grooves, a plate bridging said grooves to retain said die sections slidingly therein, a sleeve screwed into said stock, an internally tapered or coned portion disposed at one end of said sleeve, a second and smaller diametered internally tapered. or coned portion disposed at the other end of said sleeve, said first coned portion surrounding said die and contacting with the outer ends or" die sections, a spring acting upon said sections to maintain their outer ends in contact with said first coned surface, an annular memhaving an outer coned periphery engaging second coned surface within the sleeve, screws projecting outwardly from one side of said annular member, a centrally apertured disc resting upon the top of the sleeve, perforations in said disc for the passage of the screws just referred to, an upwardly extending radially disposed projection upon said disc, a second centrally apertured disc resting upon said first disc, perforations in said second disc for the passage of the screws in the coned annular body, a peripheral opening in the second disc for the passage of the projection on the first disc, nuts upon said screws whereby the coned annular body may be caused to tightly engage the coned surface of the sleeve with which it contacts so that when disc is rotated in one or other direction the die sections will be caused to move in their slots or by slacking the nuts the outer disc may be rotated independently of the annular conical memher for purposes of adjustment, and stop means whereby the terminal position of the sleeve may be adjusted, said stop means comprising a screw passing through the said projection of the second disc at a right angle to said projection, a head at one end of said screw, a lock nut on said screw, and a projection on the stock adapted to engage the head of the screw and so limit the rotary movement of the sleeve, and means for locking the sleeve against rotation comprising a screw disposed at a right angle to the axis of the sleeve, an enlargement upon said screw at one end, a curved surface upon said enlargement, grooves upon said surface adapted to engage the threads upon the sleeve, a sleeve slidably mounted upon the shank of the screw also provided with a surface adapted to engage the threads of the die carrying sleeve, a nut upon said screw engaging the outer end of the sleeve to enable the locking elements to tightly engage the die carrying sleeve to prevent its rotation.

8. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, said boss having a central opening and radial grooves or slots located therein, a die carried by said stock, said die comprising a plurality of sections mounted to slide along said radial grooves or slots and adapted to move radially with respect to the axis of formation of the thread, a sleeve screwed into said stock, an internally tapered or coned portion forming part of said sleeve, said portion contacting the outer ends of said die sections, whereby, when said sleeve is screwed in one direction to produce movement of same axially and at a right angle to the plane in which said sections lie, the latter will be moved radially inwardly, a stop for said sleeve, comprising at least two parts, one of which is adjustable, and whereby said stop, in addition to being adapted to limit the movement of said sleeve and consequently the radial movement of the die sections, permits said sleeve to be finely adjusted with respect to the limit imposed by said stop; and a member carrying one of the parts of said stop, and rotatably mounted with respect to said sleeve, to thereby permit the latter to be coarsely adjusted to any desired extent, without the use of or being subject to the limitation imposable by the stop; together with means for rigidly connecting said member to the sleeve to render the stop operative.

9. A stock, an apertured plate carried by said stock, a boss upon the inner face of said plate projecting axially into said stock, said boss having a central opening and radial grooves or slots located therein, a die carried by'said stock, said die comprising a plurality of sections mounted to slide along said radial grooves or slots and adapted to move radially with respect to the axis of formation of the thread, a sleeve screwed into said stock, an internally tapered or coned portion forming part of said sleeve, said portion contacting the outer ends of said die sections, whereby, when said sleeve is screwed in one direction to produce movement of same axially and at a right angle to the plane in which said sections lie, the latter will be moved radially inwardly, a stop for said sleeve comprising at least two parts, one of which is adjustable, and Whereby said stop, in addition to being adapted to limit the movement of said sleeve and consequently the radial movement of the die sections, permits said sleeve to be finely adjusted with respect to the limit imposed by said stop; and a member carrying the adjustable part of said stop and rotatably mounted with respect to said sleeve, to thereby permit the latter to be coarsely adjusted to any desired extent, without the use of or being subject to the limitation imposable by the stop; together with means for rigidly connecting said member to the sleeve to render the stop operative.

JOHN DENNIS WALKER. 

